What if Roboute killed a Daemon Primarch?

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**BrianDavion**

Mad Doc Grotsnik wrote:
Trouble is, being a Daemon Primarch, they cannot be permakilled. Only banished for a period of time, which given the Warp, is somewhat nebulous.

I’ve no doubt Guilliman could take one, spesh with Daddy Stab. But even so, it’s only ever temporary.

The best you can hope to arrange is to stab the poop out the Daemon Primarch, then shred it’s particular Legion as hard as possible. Leave them with as few truly loyal followers as possible.

Now. Exactly how you arrange both?

Well, there’s a reason I like my comfortable office job!

The Emperor's sword apparently is one of the few weapons in existance capable of PERMINATLY destroying a deamon. I think if a deamon primarch was slain, the reaction from the other deamon primarchs would be TERROR.

**BrianDavion**

Voss wrote:
ikeulhu wrote:
Its not just a matter of power, but of the source of said power. It is known that The Emperor is Anathema to the Primordial Annihilator, so it does make sense that imbuing His own power into a weapon could theoretically pass on that quality to said weapon. There is also the question of know how, perhaps multiple Grey Knights could harness the needed power to replicate the same effect, but that does not mean that they know how to properly do so.

Another possibility is that the Sword acts as a channel for the Emperor's energies, even while he is on the throne. This would allow it to perma-kill others regardless of who was wielding it as long as the Emperor persists, or maybe the link between Emperor and a Primarch is required for such a connection to be utilized.

The metaphysics in 40k does have actual rules that follow occult philosophies, and we may not know all those rules (such as exactly Why the Emperor is Anathema to Chaos) but they do exist. Personally, I like a bit of mystery, as things often can become less interesting the more they are explained.

'It is known' isn't an explanation either, nor is the chain of supposition that follows. What makes you think its even true?
Seriously, page reference in an existing book, because that's a pretty wild claim and other people are talking about off-the-shelf dire swords.

Chaos refers to the emperor by the name "The Anathema, we dunno what it means but the most accepted theory is that he is, literally, Anathema to chaos.